مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3289
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Anas (رضي الله عنه) that The Messenger of Allah (ﷺ) nibbled some meat from a shoulder, then he stood up and prayed and he did not do wudoo’.
Musnad Ahmad 3312A saheeh hadeeth; its isnad is da'eef]